Questions tagged [battery-charging]

Please specify the battery type in your question. Include chemistry (e.g. lead-acid), voltage, number of cells and how they are connected (series or parallel), capacity (in A·h or W·h).

Filter by
Sorted by
Tagged with
13
votes
3answers
16k views

Measure Lithium ion battery voltage (thus remaining capacity)

What I am working with: I am running my self-made Arduino board (in the sense that I use the Arduino bootloader and code editor) at 3.3V, and powered from a Lithium ion battery, which is USB-charged ...
89
votes
5answers
238k views

Why are there 3 pins on some batteries?

Lots of new batteries (for mobile devices, MP3 players, etc) have connectors with 3 pins. I would like to know what is the purpose of this and how should I use these three pins? They are usually ...
12
votes
3answers
15k views

Low current battery monitoring

I want to run a micro-controller from a 1S lipo through a 3V linear regulator. I need to measure the battery voltage however. The problem with using a voltage divider is that it would drain the ...
6
votes
6answers
36k views

Charging Li-ion batteries in parallel

I wanted some opinion on my set up here, just to make sure I got the basics right. I have a Li-ion battery charging circuit based on the MCP73113. This is designed to be a single-cell battery charger....
8
votes
7answers
38k views

How do I design a 2A or more power supply for my consumer USB devices?

I understand that many of my consumer devices charged by USB ports can charge at higher rates than 0.5A. However, in testing, I've found they don't consume more than this. Test Setup I have a power ...
1
vote
1answer
606 views

What kind of power management circuit do I need to embedded a rechargeable battery in my electronics project?

I am doing a project where my electronics runs on 5V which I wanted to power from a 7.2v lipo regulated down to that voltage. I'd really like to include the opportunity to charge the lipo without ...
20
votes
2answers
28k views

Some advice on charging circuit used in simple UPS

I have looked around for some way of having a 5 volt power supply that acts like a UPS. Basically want to use a micro usb connector for +5 have a battery and li-ion or other charging circuit that ...
26
votes
3answers
4k views

Why do batteries recover after a load is removed?

I carry a small 2-AA flashlight, and a few times, I have accidentally left it on in my holder. Each time it dies completely, so that no light is emitted, but if I turn it back off and wait for a few ...
16
votes
2answers
4k views

How fast can a Li-Ion battery be charged?

So far I've seen many Li-Ion battery chargers that do the full charge in about 1,5 hours or more. There're also NiMH battery chargers that claim they charge a NiMH battery in 15 minutes and then the ...
1
vote
1answer
3k views

P channel mosfet battery charging/power selection circuit help

I am a hobbyist and new to this, but I am not sure if my circuit it right. The goal is: To power the rest of the circuit from a DC source, a USB, or a battery, in that order. When there is no DC or ...
2
votes
2answers
4k views

Can I charge and discharge a NiCd/NiMh battery at the same time?

I presume there will be opposite movements of the charged particles inside, with collision energy being exhaust as heat. On the other hand, such a setup would probably introduce an extra noise/...
0
votes
1answer
955 views

LiPo Charging Ciruit - Switching Help

I do understand that similar questions and maybe even the same question has been asked before, I've found them but unfortunately as a result of inexperience on my part I have been unable to adapt the ...
28
votes
4answers
137k views

How to measure capacity of a Lithium-ion battery

I bought a Lithium-ion battery for a camera (much cheaper than the brand replacement but non unreasonably cheap compared to AAA Li-Ion batteries with similar charge). I however have doubts that it has ...
9
votes
4answers
58k views

Voltage input for charging NiMH Batteries

I have 12 AAA NiMH batteries(1000mAH and 1.2V per battery) and I want to know what is the optimum voltage for charging them. I am using a simple Constant Current charger(LM317 and 68 Ohm Resistor(R in ...
8
votes
2answers
16k views

Understanding LiPo charging / protection circuit

I'm in the process of learning to design PCBs and understanding electronics design. For a project, I need to charge a 3.7V LiPo battery. I also want to protect it from over‑charging / over‑...
9
votes
5answers
5k views

How much can I overcharge a 4.35V LiPo?

I'm building a charger for a set of LiPo cells. My circuit needs to make sure they get fully charged to their maximum level of 4.35V. At the same time, the circuit should protect the cells from ...
2
votes
3answers
1k views

Difference between battery and capacitor?

Can capacitor acts like power supply, in which situations? How related are charge/discharge time of battery and capacitor? Why battery has longer discharge time compared to capacitor? Why we cannot ...
1
vote
2answers
4k views

How to force variable voltage fast charging power bank to output a certain voltage?

I am trying to power up my raspberry pi 3 with a Xiaomi 10000mAh fast charging power bank through the L298N motor controller. The motor controller can receive from 7 to 35V, and it has a 5v output, ...
1
vote
1answer
2k views

24 Hr A Day Powered Aquatic Pump

I am looking to install a DC 12V 6W submersible aquatic pool pump for use in a small scale hydroponic setup. The location of the beds will be too far away from mains electrical, and I would like to ...
24
votes
8answers
37k views

How do USB charging and “smart” charging ports (e.g. Anker's PowerIQ) work?

Software engineer with a hobbyist understanding of EE here. I've noticed lately lots of claims from producers of USB battery packs that their ports are "smart" and "identify the device" to "deliver ...
14
votes
3answers
21k views

Understanding Two MOSFET with sources connected

I am having problem understanding how this MOSFET configuration (used in battery charger) works? In this slide, what does it mean "blocking voltages in both directions while allowing ...
4
votes
1answer
851 views

Unable to understand Drone's LiPo battery capacity loss

I have ruined a 3S LiPo 5400 mAh and I am unable to understand the reason. This is directly related to my earlier question which was about same battery. I bought a new balance charger and put the ...
16
votes
5answers
77k views

Powering laptop from 12V sources without inverter

This question has two parts: 1) How inefficient is it to boost 12V to 120V and then back to 12V as in using a traditional car power inverter to power a laptop (i.e. the 12V car battery power is ...
9
votes
3answers
5k views

How deep should we discharge lithium batteries to maximise their lifetime?

Recently I posted an answer mentioning the very classic "lithium batteries like partial discharges, so design your system for limited depth of discharge". But then I wondered: with partial discharges, ...
5
votes
1answer
4k views

Dirt cheap NiCad charger

So sharptooth has a question up for creating cheap charger units that uses battery packs to charge a phone: Is designing and producing a dirt cheap charger really that hard? My question is the other ...
4
votes
3answers
3k views

Battery monitor for a camper van electrical system

As one of my first DIY projects, I'm going to build a battery monitor for the DC battery/solar/inverter system in my camper van. The van has 440 Ah of lead acid batteries and DC currents up to 200A ...
2
votes
1answer
2k views

Solar Cell - Preventing overcharge of an NiMH battery

I am trying to design a circuit and was wondering how to design it that the 12V 800mAH NimH battery I am using will not overcharge. I have researched trickle charging and as far as I understand, a ...
1
vote
1answer
3k views

Charging NiMH batteries with 1W solar panel, charge controller needed?

I want to know if a charge controller would still be needed despite the solar panel never outputting more than C/10 of current to the battery. This is a follow-up about my question here. The solar ...
1
vote
2answers
683 views

Can solar panel charging slow down the draining of phone battery? [closed]

I have made a solar panel charger, it consists of a 1.2 watt panel connected to a buck converter, then to the phone. Now, when I connect it, it charges the phone and in the battery settings it shows ...
1
vote
1answer
665 views

Non-led simple bicycle dynamo light system

There have already been questions about how to build a bike power supply based on the bikes dynamo. Most of the answers contained lots of basic components. Some answers here are making a full wave ...
1
vote
1answer
3k views

Remove over-current protection of battery protection circuit

I have a hardware that is powered by a standard polymer battery (http://www.ebay.com/itm/3-7V-Polymer-Rechargeable-Battery-2000mAh-PCM-103450-for-GPS-ipod-Tablet-PC-MP3-/262605237924). The hardware ...
1
vote
1answer
77 views

How determinate parameters for thermal-model battery (Advanced question about battery modelling)

I'm trying to simulate an electrical model based on Ceraolo battery model for lead-acid battery. The challenge in this model is to determine the parameters that describe it. I can understand and ...
17
votes
1answer
23k views

Why charging Li-Ion batteries in cold temperatures would harm them?

Accordingly to what I've found in several sources (user's manual of electronic devices, various forums, e.t.c.) I shouldn't charge my Li-Ion batteries in cold temperatures because this would harm them....
6
votes
4answers
5k views

Algorithm for charging LI-PO batteries?

What is the algorithm used in charging lipo batteries? From watching my charger, I see that the amperage is close to the maximum specified (i.e. what I keyed in) at the beginning and gets smaller as ...
4
votes
1answer
5k views

Smart charging circuit for NiMH battery pack

I want to build a solar powered charger for a niMh battery pack to run a microcontroller. What are the fundamentals of building a smart circuit that will not overcharge the battery and will also allow ...
5
votes
3answers
7k views

Circuit for recharging Li-ion Polymer Battery

I have a Li-ion Polymer Battery (Apple 616-0550), 3.7V 3.44Wh (~930mAh) salvaged from an iPod Touch 4th. What do I need to know in order to build a recharging circuit for this type of battery? ...
7
votes
1answer
3k views

What component of my phone charger produces chirps and how does it do that?

My Nokia cell phone is charged with a very lightweight compact charger similar to this AC-15 (can't find the one I actually use). While the battery is close to empty the charger works silently - just ...
7
votes
1answer
2k views

Charging two lead-acid batteries connected in series, separately (with two solar panels)

I have two lead-acid batteries connected in series to produce 24V. They are powering an audio amplifier. I'd like to be able to charge them while they are powering the amplifier, with solar panels. ...
5
votes
1answer
6k views

Lead Acid Battery Charger Design Factors

In any lead acid battery charger how does the per ampere rate of the battery being charged factor into the design. I think. You have to worry about the current voltage, and the current current being ...
3
votes
1answer
3k views

Solar battery charger with load sharing

I'm looking to design a circuit around the CN3065 that will be solar powered with a li-ion backup battery. I've seen circuits that can achieve this by using a charge controller with a dedicated load ...
3
votes
1answer
2k views

Load Sharing charging circuit for Lithium polymer

Charging lithium battery while at the same time trying to use circuit didn’t quite workout, with problems like the circuit not turning on and the battery never finish charging. The battery is 3.7V ...
1
vote
1answer
1k views

Over current protection for a 1-cell battery

I have a one-cell battery which protection circuitry is based on a DW01-P (with dual mosfet 8205S). The datasheet says on page 2 "Overcurrent detection voltage = 150mV". How do I translate this ...
1
vote
2answers
901 views

Powering circuit directly from USB while charging li-ion battery side by side

What I am thinking of implementing: 1. I have remote monitoring circuit using gsm which senses electrical parameters like phase, power, ac supply etc. Now considering case of no ac supply available ...
-1
votes
2answers
157 views

Switching Between Two Power Supplies Without Reverse Current

I'm new to electronics, so I'm bound to have gotten something wrong. I'm designing a basic sensor and want it to be powered by USB by default, but use a lithium polymer battery when not connected via ...
14
votes
4answers
3k views

Battery chargers that can recharge disposable batteries. How do they work and are they safe?

A few years ago a product called SecondWind appeared, which claimed that it could recharge disposable batteries. To a layman like me that sounded like a great idea, but does such a product really work,...
10
votes
4answers
12k views

How is fully charging a Li-Ion battery in 35 minutes possible?

I happen to own a power drill/driver that runs on a Li-Ion battery and ships with a charger that charges it fully in 35 minutes and claims to charge it to 70% in 15 minutes. According to answers to ...
5
votes
1answer
6k views

Adding a battery backup to a circuit with external power supply

I want to add a LiPo rechargeable battery backup to an existing RTC circuit, but I can't alter the preexisting circuit. Basically, the regulator, D2 and RTC (Existing Circuit) are all fixed and can ...
3
votes
3answers
674 views

Are laptop cells balanced while charging?

I have little-to-no knowledge about how the laptop batteries work. I know there is a microcontroller to actually verify the balancing between cells (and in case blow up a fuse or something similar). ...
2
votes
3answers
2k views

Possible to charge one phone off another?

What's stopping the ability of charging a cell phone from another cell phone? If I were to create a crossover/patch USB cable and connect it between two phones or tablets, would there by any way to ...
1
vote
2answers
2k views

Using TP4056 module to charge battery while load remains connected

I need a circuit that utilizes the tp4056 breakout board to power a NodeMCU ESP like so: tp4056 USB port connected: 18650 battery charging and NodeMCU running of USB tp4056 USB port not connected: ...